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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafc5042796a76ec31fd01ac17f678a527babd022fac3b694b647d29d3cf8ae1' 
  AND token = 'XzmESnLxDABc9F714znq1AWzxAgAwY7IGhlF3/JaBX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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