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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c112ed13327ec1f33382d0e5c63b034f47e71f0df6c0a76569d7ebf43b523de' 
  AND token = 'XlkNyLzS9WxozWKVw7fEHOMyh1YqVVRCri9k+ob2gvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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