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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583ad9a214aec920e04c91d534b5817253c37097a34b487d63f5d9de0e98948c' 
  AND token = 'yHDw/0beW6EKThM/AWaNutAcrk9pEF97uni0NJQOM4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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