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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0017e70bd8e0fd88b97d19d1e48ec4e9a83ca9db475397c6301d0bb031cabd' 
  AND token = 'yFEwICV844AJHbVoZ7ZJTIDnvX032/E5CuO+76nE6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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