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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986b2ffee27affc30056ed61bb4790693a7861ca5af293c8f9e1db8492f606eb' 
  AND token = 'a9JhedfP7XeZOfb/v7NDF5pAu2hPHyuo2WuH1oJROYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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