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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b949a9ab7dbfb9a47e8267274e7ed39cb4fc4ed3ad843e50f91c31f313b4d38' 
  AND token = 'h/PEKFl2AmqtPcLrFHcBL9MQtSeUnxP+rAyvS8pzo0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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