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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf6a6a8ccde1c42da49bdde30f67c1b2000a49fcd83f7d9cea67acf873493f2' 
  AND token = 'Ajws2RkxqyCtzl7tCy1ui5MkfGxCiY4fT+ibYTyAf+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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