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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9626922718b8a44561eae13840512dfdd13082213f376e7ee8eab3110d955e1' 
  AND token = 'N5EmJNJ+SM68KgHP77oWoFvDizWlP1/4rcHHyXJrpQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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