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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b061064baf8c08f44fe399a5eb4569795971699ba4f7874ed66d24dc2d6f5a8c' 
  AND token = 'waT8tEXCNLc0PQ/PrlKFnZ1egM9542A8Ia8VQAxnBK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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