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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d474c42f74232f70becb0cd99b2e8b8b2a83ab35b18b510d9c6a1d5f21f50ed' 
  AND token = '2ywWaJELvbFkx7A79h2HY6peuafNHqq2GKtQmB3AjHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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