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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b334a32b0a61a3a965ee3160a93d3a21232e3ad90df77b7153b4639b2f92c2' 
  AND token = 'WLhoKZPpFiIJM6PABzZZfo/EE5BP88c9nvG7RKcpzQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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