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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0c11ca583724461eb2ba7e7cf7fdbc33230e0c9f2b49a6c9748b954cec409c' 
  AND token = '6raASVJo1vYraD59MEr3czURxLORD5YvNbG5XNqeVqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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