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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c971b5852ec794b7e6b73b38a3682240e3263e763316c0626c908a01cb8fa3a' 
  AND token = 'g8atNpTTa4WuvPEqK49wbmLhtJAqas3H7uvZvJeUsqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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