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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee56e7cf5b0ffb3c8ae4c5ca3441fd1b574ee7a2c6adb01f5e34c734e1bdd6ec' 
  AND token = 'rP1BqLc0QvilO2LlKuHqINj/HVsPFrKZVu9hyXcIwds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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