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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce5ae32bc98c1b81cd2a32ec6d4afdfe4d4004b880dbf37c8dd799505bc41ba' 
  AND token = 'j22xlOm0t/akAWPhIEqjrjYOioy7mgJULd2YTjLr5sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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