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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e747db05ed58fc5d22ba8f777dc2bb2ce5011f98f3ee0c9c942aa69dc4e8acf3' 
  AND token = 'GSi17EF4QZ16BXVOOI4ZmOkWcsi06T4BYOIejK/tTp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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