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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83840a7c4d72c5a23ba122b474ff96911f96ee37589e7ca11e617212211a3a9' 
  AND token = 'ng6ZEgFP2txD881mwHrZVbSUfAjxNN5esAu69pw6q+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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