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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef6d2dc39d89b19308bb7d48c316e42d30b5aa14c645c988728fe357170182e' 
  AND token = 'R6NlxqjyVl+XkotWoFgoWIKdnxhffz5iz+Eo2Idp63Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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