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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3088956231f34a38b59d33b00f5ebd31071bb8935e32552c6115c7e6a406c393' 
  AND token = 'bx9623zRrI75pUBuw82Vd/uHZiDwjbNouwkSn/E8N5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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