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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b56392b44e39d0b0176a01dc7e4c933b842a92e61ac098363d418373826b206' 
  AND token = 'NKeKXQLw/QDPL97uF3suF3JaBDQj5O3bSBAPxz7jNcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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