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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e570892ca5cebc129d62cb190d211b41bd04dd9bd81f41458a07d3d3686347' 
  AND token = 'elhZ97Dn4p0+7Rx29iSRc0wlKh3aTjlmvvi0TaUZxo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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