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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a58947a3a4d6dc96340ab362f73a4b8dd1b3ddcb1fb068e22656f69bcf9db9' 
  AND token = 'f/TUZeKlYXt2JBr456sf5N3uS2IF5xEeCoiHsOnLNLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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