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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db3b7380a79e9f34c50b4fc942485cb5e417c71aecd4d8027bd014658342d50' 
  AND token = 'PloumfhQtZxz9J1vH95Zh5QAZDcZByHCJXYtvDpF5Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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