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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155ef387aef0fed0f5643ee41294080eb4fc585062c8c305143ff30467e6c638' 
  AND token = 'NemtMhGVEVde7WITcz0sRMTJIhdZT3kuM6ZJW4I8QKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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