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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358d15af8eed9d1ff5fc984627f9b685dc552330fed52e8ad73f18d407ba3ca0' 
  AND token = 'P20/6j0vG/cxmoHXxUlXG6VpjG0MOkCFpJtL8ovMSnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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