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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf0f3d9f58c3d9c2f1d8ee1b2f5a44d6cde73a55349fb0084781eedc07dc8b4' 
  AND token = 'YgZ/Xgg7JNexR6MXZwUktRPAv99fCs8qnSgEdT7LNJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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