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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e5f84598f51da65c5cfcb43bf3e7da1eb532f6449b0821c6d87336ef25b2b1' 
  AND token = 'LK2xf1dPDdLPB7AYFLl2Ek3JoOkSdOwIn4nrIU93gvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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