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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928aead02412b904b20bc7ae398b1a04701aa879012cb5a344976ce62664edf9' 
  AND token = '8wm46g3ie6A0OP5j1Ghh9MaYUlJqb6pbjuWfAk2DCi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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