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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd430faa883413e116808ca3a1f198c3b7f46a8ac8a4a890479cafda2dba906ba' 
  AND token = 'MQVvchsPki0M8/dO474jlziTc/EgJ2SmnfMt9YkG9Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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