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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b04b8f04addac0eff5a8e7b71dd47a9ea2a46ac29a04b2bc35ecb84aee846b' 
  AND token = 'cY0RZ2WzCfA8YuqpXS92g0YZnUW9sbK+qNherAsaRb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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