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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51232acf31953e97cc69fae9c7b028065778915230028512942d09db3c5912f7' 
  AND token = 'aprGbsrTCD2S09ElaqTF0bGf1f/NXj22+UNbEt2+Ulw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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