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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030882e47ef954a43710b79729071c0b4700ce808f2620ec20131a841434a19c' 
  AND token = '8+Uhqz/YhBsH8A8zk65qRDsnHwtutwy4hmoZkNx2jzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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