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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07c80a98e128417221d12d6d0a07640d316d18c312f902828092c7d9f875527' 
  AND token = 'wH+UzcL6Dd7eTrIPCkekHEz4pxWzny6DrIXaZAC4qtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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