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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2993f80e98f10dcd2ad87b7c2fbeb35ad60b55121d4c345d6ee1c546da65e877' 
  AND token = 'x4SyhT0BarXkpebbbi1XzeLlWRrq2Dv6ZYZis77BZdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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