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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25318c2ed27bc443817a83a2b1d5840111b202163aad79ca79fae9d1bef886b6' 
  AND token = 'XORLcpd96Jb2456B1u9uwh/4O7UDa0SUltok1Xe1IQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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