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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c74dd8fe3812b070a35bd824cd90f74351f0df9cdb82c8d4b37a45a8ae4e693' 
  AND token = 'lsQCNOu3AWinuVID9+zU6mb5SO1T4xAxkbh8VfUs6OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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