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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9389ee9dd6df0ac119c8e31d0b868b6e596b90c81bdde2fc95c35cc38443a7' 
  AND token = 'NbFGgU1poa/+/5KRVlR+6WEUZb7NWeoV2rh8fIsOS4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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