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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f8748a707e38c320896e0aac694f61196bede2d96fccbefc39febd439731df' 
  AND token = 'AzlM/b0zm9x1v+LQR+28UrOU7BScgZBUypItJd/4KVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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