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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b2a4a15ee04a0093332cd90a178edaa3cc6cc56e706f4d4b734f495d330c4e' 
  AND token = '6pJutO5u+smaz7ZUAFn6oC6hLkpmuidgcYXnhRCfTog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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