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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ad9d7b7a67fb8678475a1bb352608ca1d07688a1f76f4c7e561f8f477bd370' 
  AND token = 'FX/ooE7Ob9ikdHaU1YTNjc3mJKRTVskO/Gg1Ria7l0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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