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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c18225ef312c9c27caae9b50f85840bec2d8f7c7594c3620a55f8942e5dd85' 
  AND token = 'cFiSgxIvGwDrRu3obxxJffDpYSdnjcDm/k685IlV9pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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