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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facaaa742f3e552840ee83ef220b374db4630a187f7ce25a68b4e1cd6a80e1cb' 
  AND token = '5NWSGFoJR1TMOsm5sEjUTC0326tFo5FV+7EBNPq+36E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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