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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef26286cf8e0cb0f4a7cb61ba49b9fecd1a2e5665e5d7b66f7a8025dac0553d5' 
  AND token = '4dWCOlbrO+WJObXgzbaVOEYiO/f68Lfn7pslKAjDucE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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