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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2640ccdd6d33c5686446a6ac38abf0c98375941c71326713b092292a082332e0' 
  AND token = '/0nY93s7IlbPCWbTRnNVJvvAmEH29f7RQ/37Si546pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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