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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15f62ec16e4fdedcd42472834de92b72bcbc7bb64f6421b89b2c5438b4edc65' 
  AND token = 'iQUM/YuJe2d0eCip4OdjvicuRZF3CakHq+6t+IwQLrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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