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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e91afcffc05657df25133623445dbdd60dc03ed22c09b494312651535d3761' 
  AND token = '6bCCBpvsbSlBdl6WCwgRUdbXK72vOS9e15wt1g66c5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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