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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0626aa67d375f01a75d783c1b7fa4f34788a54963931da6568f2874ee16f0229' 
  AND token = 'eK6+uKUK0V1bED5qtxK/kIjPi5lO/SoX06GiyLt9jxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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