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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abb2f8bdaa4e6b9b6fec91064590aa5c140ee2904082423b8909ee014f97ba3' 
  AND token = 'QQo6841QdDKhIpFy0a/F8TdVbjt305fCRYt4RyetkKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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