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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71d65325098d4b8922b20bf99db358f927469c1913adb316cbeaee7fa53e4a4' 
  AND token = 'Tq5et440b8plSiuKInigemarEfPrfi5M87abRbtpqw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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