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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690649dbbf0ee67b176ae5b36f253791d03f6193f294fc8a7a257cb3cbb1fa10' 
  AND token = 'AqJyQKRSWzAyYf9QI8DU4R5AFoqA/uC1Sk5e2ImeTuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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