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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332899a463202a30d4cc28b13e819efa964ba1cf1bda1772a408e52f4b359742' 
  AND token = 'qodho5MNb8VMl68heV9hnkt0oUmj6hKcY1PmZEJESqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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