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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f17cb904b82b636b4f48aa75e009c2f83d784e9c2ecd879fa394dcdffe12541' 
  AND token = 'Co9C2aFZG9KN1bF63TFeP6HkL46ez8GOD1lgWbkTz2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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