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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f750ce27f5325df7fdfa2ead33961975b79cd7a2970381c66eb8b84bae036b56' 
  AND token = '8UO7t/kOfB/eLTi2qFiR4QS1f7gFDuiKRi1na6+ZICs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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