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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870b65ef0f4a020d114c04244bee9edb26d42d510e99bc36c26c9b5e579a28f8' 
  AND token = '7wDhBwJzxSU65zGfdpYLhiUvgUc17Us6doQsQH6gClA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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