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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf5fae219b6594fce08a5daedcba9df35f5ce342ca45dcf86378a60c4ce616f' 
  AND token = '6veizJZGos4zEXbqfts1BIik3ZvBwonUvJQcIgE1D1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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