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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37bfc1836a7acb2f346f377f97dc500ee819d81f2a7064bae1601bf5ade92e2' 
  AND token = '6B9rw1C4LDH596w4V9CpSVCRMyvjXvYf94it99TpgQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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