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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa90013dd76966b5d14e3ddf8af6f21f74f76af1f2b14c7611401a550c5985bc' 
  AND token = 'ZCR7DbZZBAxBCJyE2qAiyqccsjPNMwROINz1welK+Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}