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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf6bd98f709f3548ef271195f8ddfebc7d0772850cfbb0f093b4bb6e5d0db74' 
  AND token = 'k+lrg2lLVat5WTUW4nqBSIvPuXYGOHJ7aQfGE6DGl5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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