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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226f965a51f8e1786e8c76d1809d9736ec34c09b4c24693a4ba4e8533baba7ff' 
  AND token = '/soZjJrwD754ogbr6IxsxJp3QyapyZn1JP0nz9zEf8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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