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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10689f8fa82c645980468dcf0426f560cd29fbe2a622aab9d5ab76f55c53b012' 
  AND token = 'kpWCs/bIYiqNww3d+j6cjiNAXwBQtp8QIOCwSalEZn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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