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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2175bea5ba6395ae413267804fda395a2c57b04d7b2b8ad7632fea89193ed51' 
  AND token = 'd7MnUdIlV+mywF7jIgWRHwtOK8C3d0xvNN0mQPohEjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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