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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad06c7b3760acce4c12252dc27eabcf4e7c2765ea9f5109ff00289fca84ab9f6' 
  AND token = 'jEEWwSYVtETO/Zy4WL5PLJmd4WFS49Xv6S2pGcLwGag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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