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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a213b7f6e81c45e3633c62de2e032479e1476b8b9e6d11004cb7cc3dae70ce77' 
  AND token = 'Gyu1cDdZiUPph5sx8wsbp4hBkncUmaLWLsQBLtNtm+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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