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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85726c446c3596f071e2a228f592a30f384c5093d4ac25b6260a6c2fc4897422' 
  AND token = 'G+1yYSV5WLF24j7U6OcWO97t/3JcRkSQ5ONSLTMIM/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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