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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef80f05bfd9a76b098f8839f44c1da54b930cd57b1303584e401eb6176da7406' 
  AND token = '+FZ2SCNffrE3N4fRem5HLAmXxV6hQx8Y68xoupwKTR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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